The fast-food business hasn't introduced hundreds of new Whopper-like sandwiches.
Few recall that Burger King had a distinctive sandwich before McDonald's. Before the Whopper debuted Burger King in 1957, both had simple, execution-focused menus.
In the beginning, neither chain offered limited-time or permanent specials. Both Burger King and McDonald's sought to provide a burger (or cheeseburger), fries, and beverage.
Burger King fell behind its competition, which established its first restaurant in 1955, and created the Whopper. The Big Mac didn't emerge until 1967, a decade after that sandwich's breakthrough.
Once it arrived, the Big Mac was a smash. The restaurant has avoided introducing versions like Burger King's Whopper to avoid diluting its success.
McDonald's has experimented with the Big Mac brand abroad, but in the U.S. it's mostly played with sizes. The Mac Junior was like a Whopper, whereas the Grand Mac had larger patties.
All three were variations on the Big Mac's basic recipe of "two all-beef patties, special sauce, lettuce, cheese, pickles, onions, on a sesame seed bun."
McDonald's has been cautious of its distinctive sandwich, while Burger King has pushed out dozens of Whopper-branded sandwiches.
Since chicken joined the McDonald's menu, a Chicken Mac appeared obvious, but it was unclear if it would feature fried or grilled chicken patties, or both.
The Chicken Big Mac swaps beef patties for chicken, according to the website.
If the test goes well, McDonald's will roll out the Chicken Big Mac nationwide. After a successful pilot in the U.K., the fast-food business decided not to roll out the McPlant countrywide.